18161143037540 has 72 divisors (see below), whose sum is σ = 41158135163880. Its totient is φ = 6708133279744.

The previous prime is 18161143037519. The next prime is 18161143037549. The reversal of 18161143037540 is 4573034116181.

It can be written as a sum of positive squares in 12 ways, for example, as 150506754304 + 18010636283236 = 387952^2 + 4243894^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18161143037491 and 18161143037500.

It is not an unprimeable number, because it can be changed into a prime (18161143037549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8552795 + ... + 10462914.

It is an arithmetic number, because the mean of its divisors is an integer number (571640766165).

Almost surely, 2^{18161143037540} is an apocalyptic number.

18161143037540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18161143037540 is an abundant number, since it is smaller than the sum of its proper divisors (22996992126340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18161143037540 is a wasteful number, since it uses less digits than its factorization.

18161143037540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19015841 (or 19015786 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 18161143037540 in words is "eighteen trillion, one hundred sixty-one billion, one hundred forty-three million, thirty-seven thousand, five hundred forty".